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4-((4/5)*(x+15)) = 4 // - 4
4-((4/5)*(x+15))-4 = 0
(-4/5)*(x+15)-4+4 = 0
4-4/5*(x+15)-4 = 0
4-4/5*(x+15)-4 = 0
4-4/5*x-16 = 0
-4/5*x-12 = 0
-4/5*x-12 = 0
-4/5*x-12 = 0 // + 12
-4/5*x = 12 // : -4/5
x = 12/(-4/5)
x = -15
x = -15
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